Hypodermic syringe.



No. 766,204. PATENTED AUG. 2, 1904.

Y R. WALSH.

HYPQDERMIC SYRINGE.

LPPLIGATIOK FILED NOV. 18, 1903.

I0 MODEL.

INVENTOR 154mm 1 B1" W UNITED STATES Patented August 2, 1904.

PATENT OEFIc "L 'HYPODERMIC svnmez.

SPECIFICATION forming part of Letter! Pfltent N 766,204, dated August 2, 1904.

Application filed November 18,1903- Berial No. 181.725.- (No model.)

To all whom it may concern;

Be it known that I, RALPH WALSH, of Washington city. in the District of Columbia, have invented a new and useful Improvement in Hypodermic Syringes, of which. the following is a specification.

My invention has to do with syringes designed for the hypodermic injection of antitoxic serum; and it has to do more particularly with that kind of suchsyringes in which the hypodermic needle is connected to the serum-containing cylinder or'barrel by a fiexible tube (usually of rubber) which receives at one end the nozzle of the cylinder and at the other end the base or shank of the needle.

It is my object to produce a syringe of this kind in which while all the aseptic conditions are maintained the parts shall be assembled and fitted together in condition for practically immediate use.

The principal. characteristic of my invention is that the flexible tube, which connects the serum-containing barrel or receptacle and the needle, is provided at a point between its ends with a diaphragm or partition which before the instrument is in condition for use shuts off communication between the serumreceptacle and the needle and hermetically seals the nozzle of the receptacle, but at the same time is adapted to be penetrated or ruptured by the shank of the needle when the latter is pushed back in the tube, so as to open communication between the-.lneedle and the receptacle. The same expedient may be employed in connecting the air-bulb to the other end of the receptacle in case an air-bulb be employed instead of a piston or plunger for the purpose of ejecting the serum. This and other features of my invention will be readily understood by reference to the accompanying drawings, in which- I Figure 1 is a longitudinal central section of ahypodermicsyringeembodyingmyimprovements, the parts being fitted 1 together in the position they occupy before the instrument is put into condition for actual-use. Fig. 2 is a like section of the same withthe parts in condition for instant use.

A is the serum receptacle or barrel, preferably of glass and of any approved construction, with contracted ends forming-nozzles ab.

B is the tubular hypodermic needle.

C is a flexible rubber tube toconnect the receptacle A'and needle B. The shank of the needle is inserted in one end of the tube, and the front nozzle a is inserted into the other end of the tube. The interior or bore of the tube is of two difierent diameters, the front portion being of a diameter to fit tightly around the shank ot the needle and the rear portion being of a diameter to fit tightly around the nozzle a. Integral with the tube andintermediate of its ends is the internal partition or diaphragm p, which normally extends across the bore or internal passage-way of the tube, shutting off communication between the needle and the receptacle A and forming a seal for that end of the receptacle.

The shank of the needle, before the instrument is put in condition for use, extends not quite to the partition p. The partition may be of any desired thickness; but it can be made very thin-say from one thirty-second to one sixty-fourth of an inch in thickness without impairing its efiiciency. In order to open communication between the receptacle A and the needle, all that-is required is to push the needle back into the-tube until its rear end butts against and ruptures or penetrates the diaphragm 2, thus making the passageway between the nozzle (1 and the needle 0011-,

tinuous. This when a thin diaphragm is used can be done by the blunt end of the shank, such as illustrated in the-drawings. \Vhen the diaphragm is of greater thickness, it may be found necessary to sharpen the rear end of the shank, so as to increase its penetrative power. The same expedient may be employed to connect the air-bulb D with the rear nozzle 5 of the serum-receptacle, as shown in the drawings, wherein C is the rubber connecting-tube (the duplicate of the tube C) having an internal diaphragm or partition 2' and fitting at one end upon the nozzle Z) and at the other end upon a tubular metallic stem or shank B, which is secured by' its base as to the air-bulb D and opens into the interior of said bulb. The stem B is shown in. Fig. 1 in the position it occupies before the instrument is put in condition for vuse, and in Fig. 2 in the position it occupies after it has been pushed'inward far enough to rupture or penetrate the diaphragm p.

I would here remark that I am aware that instruments of various kinds have been pro vided with a tubular shank or stem to pens trate a stopper or other seal and to then serve as the channel of communication between the interior of the sealed vessel and the outside implement to which the stem or shank is attached, and this expedient of course I do not claim as my invention.

It will be noted that when the parts are assembled, as in Fig. 1, the serum-receptacle is hermetically sealed, while at the same time the parts are held together as aunit and in condition for almost instantaneous use, all that is needed beingto push inward the needle B at the one end and the stem B at the other end until they rupture or penetrate their respectivesealing partitions or diaphragms p and p.

The external portion of the needlethat is to say, that portion which protrudes beyond the tube Cis protected and maintained in aseptic condition when not required for use by-a slender glass sheath 8, Fig. 1, which fits down over the needle and has a hell or flaring mouth m, which fits down upon 9. correspondingly-shaped seat, formed-of small block 1:, of rubber or equivalent material, which 'is perforated so as to fit upon and hug-closely the needle and is of conical shape externally and of such dimensions as to fit tightly into the mouth m of the sheath when the latter is pressed down upon it. The needle is thus hermetically sealed against outside influences, while at the same time the sheath can be removed (as in Fig. 2) whenever it is desired to expose the needle. The needle, sheath, and seat-block 7c are sterilized before the sheath is fitted to its place. The block k clasps the needle tightly and will remain at any point thereon to which it is adjusted. It can be used as a hub to be taken in the hand when it is desired to push the needle inward to penetrate or rupture the partition p.

What I claim herein as new, and desire to secure by Letters Patent, is

1. In a hypodermic syringe, a flexible tube,

having its bore or passageway interrupted by an internal diaphragm or partition intermediate of its ends, a serum-receptacle having a nozzle fitted in one end of said tube, and a hypodermic needle provided with a tubular stem or shank, which is fitted and held in the opposite end of the said tube, and is adapted, when pushed inward. far enough, to rupture and penetrate the partition or diaphragm in the bore of the tube, and establish communication between the needle and the serum-receptacle, substantially as set forth.

2. In combination with the serum-receptacle and its nozzle 1), the air-bu'lb D, the tubular stem or shank B secured to and opening into the interior of the bulb, and the flexible tube 0 with internal sealing partition 2' intermediate of its ends, fitting at one end upon the nozzle 6 and at the other end upon the tubular stem B'under the arrangement and for joint operation as hereinbefore set forth.

. 3. In a hypodermic syringe, a hypodermic needle, a perforated rubber block it fitting tightly on the-stem of the needle and serving both as a seat for the glass sheath, and as a hub for the convenient manipulation of the needle, and a glass sheath inclosing the needle and fitting down closely upon the exterior of .the block is as a seat, as set forth.

In :testimony whereof I havehereuuto set my hand this 18th day of November, 1903.

Witnesses:

W. LEE HELMB,

ManonLnns BAILEY. 

